tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.8epss 0.5%
exploitation probability
0.5%top 59% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()
Sashiko found that iptunnel_pmtud_build_icmp() and
iptunnel_pmtud_build_icmpv6() were caching ip_hdr() and ipv6_hdr()
before an skb_cow() call which can reallocate skb->head.
Fix this possible UAF by initializing the local variables
after the skb_cow() call.
Remove skb_reset_network_header() calls which were not needed.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/50750d86a2e5266aba0c295483b3397843198b11https://git.kernel.org/stable/c/6dff77899b9e9fe5d854abda3a98ad04e7229ef7https://git.kernel.org/stable/c/7254aef4d1a7e18e887af9010e2f2dc34806789bhttps://git.kernel.org/stable/c/76cd9398a0470257ab765bdf5f358a2af2e17934https://git.kernel.org/stable/c/95b6d772bfe788331d9742d73eaa12e113b2adc4https://git.kernel.org/stable/c/b4bc94353050b1fa7b702bd4c6600710dd926cffhttps://git.kernel.org/stable/c/bf8b3f34c37c162357138e7c0942723b8b94fed1https://git.kernel.org/stable/c/f3f204541f280a6ecb04503a0d6794d93990ca43